Engine stop mechanism.



L. M. P ETER. ENGINE STOP MECHANISM.

(Application filed Feb. 17, 1899.)

No. 633,090. Patented Sept. 12, I899.

(No Model.)

. gine in an extreme extent, it thus only re- UNITED STATES FFlCEe PATENLOUIS ST. PETER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO \VILLIAM H.GRAY, OF SAME PLACE.

ENGINE STOP MECHANISM;-

sPEcirIcA'r'IoN forming ert er Letters Patent No. 633, 90, datedSeptember '12, 1899.

Application filed February 17, 1 899. Serial No. 705 808. (No model.)

To all whom it may concern:

Be it known that I, LOUIS ST. PETER, a subject of the Queen of GreatBritain, and a resident of Springfield, in the county of Ham pden andState of Massachusetts, have invented certain new and usefulImprovements in Engine Stop Mechanism, of which the following is a full,clear, and exact description.

This invention relates to a class of stop mechanism for engines in whichan electromagnetic force is utilized by the closing of the circuit atany suitably-distant point from the engine for causing, through theoperation of the novel mechanism, an almost immediate stoppage of therunning of the engine.

The invention contemplates the employment of a cylinder or chamber and adiaphragm or piston therein, a pipe for supplying steam or other fluidunder pressure into said chamber or cylinder, and electromagnetic meansfor controlling the admission of the steam or piston-operating fluidinto the cylinder, operative on the closing of an electric circuit, thesaid piston being made available to insure by its thrust thediscontinuance of the running of the engine.

In the accompanying drawings I have illustrated an exemplification ofthe invention as carried out by an arrangement of the mechanism wherebythe thrust of the piston causes an operation of the governor of thesteam-en maining to be understood that this special extreme motion ofthe governor operates to stop the engine in any of the several ways,

through intermediate connections, that governors ordinarily accomplishthis result.

In the accompanying drawings, Figure 1 is an elevation illustrating acommon and wellknown form of steam-engine governor, and, in conjunctiontherewith, the chamber or cylinder, the diaphragm or piston therein, theconduit for a pressure fluid entering the chamber below the piston,avalve for said conduit, and the electromagnetic means for controllingthe valve, this view showing the circuit comprised in theelectromagnetic means open and the said valve restrained in its closedposition. Fig. 2 is a view in all respects like Fig. l excepting thatthe circuit is shown as closed and as insured thereby that the valve isreleased and opened and the vertically movable sleeve of the governor inconsequence thereof elevated in a considerable and efficient degree.

In the drawings, Arepresents the post or stationary upright of thegovernor, comprising as an upward extension thereof the post A Brepresenting the sleeve of the governor, vertically movable up and downon the post in the usual manner under the actions by centrifugal forceand gravity of the weighted governor-arms a a, linked to the sleeve B.

Inasmuch as the governors of different types of engines haveoperativeconnections to different'means and under different arrangementswhereby the excessive movement of the movable member B of the governoroperates to insure a discontinuance of the running of the engine, it isdeemed unnecessary and inadvisable herein to illustrate and describe anyparticular one of the many wellknown mechanisms through means of whichthe rising motion of the movable member B of the governor checks theengine. The accompanying drawings,however, show atransversely-projecting lug b, affixed on and extended from one side ofthe governor-sleeve, to which is secured the rod d, which constitutes amedium of connection between the governor-sleeve and the engine valvemechanism to secure from the sufficient elevation of the sleeve theoperation of the valve mechanism of the engine, and it is needless tosay that, so far as this invention is concerned, the upward thrust ofthe rod d may-either directly operate on the throttle-valve or mayoperate upon the grab-hook mechanism to insure that the grab-hooks intheir reciprocations will have their movements in paths so as to passthe cylinder-valves without operating them for the admission of steaminto the engine-cylinder.

Proceeding now to describe my novel mechanism exactly as I haveconstructed it, 10

represents an inclosed chamber comprised in a cylinder in which is adiaphragm or piston 12, having the upwardly-extending pistonrod 13.

14 represents a pipe understood as having connection with a suitablesource of pressure fluid, such as the steam-boiler, this pipe enteringthe chamber in the cylinder below the piston. V

15 indicates a valve or cock in the pipe 14, of which 16 is thevalvestem, on which is the lever-arm 17, provided with the weight 18.

Suitably adjacent the valve-operating lever 17 is an electromagnet 19,coacting with which is the armature 20, the same being arranged so thatnormally and when removed from its position as drawn to the magnet itwill serve as a latch ordetent for restraining the lever 17 in thehorizontal position indicated in Fig. 1. The electromagnet is wired inthe circuit indicated at 22, such circuit comprising a local battery 23and the contacts 2t and 25, which latter are normally separated, onebeing closed against the other by the push-button in the most ordinarymanner of closing circuits for energizing electromagnets.

On the movable member or sleeve of the governor is secured the angle lugor projection 11, with which the piston-rod 13 has an engagement. Thisengagement is here indicated as made by constructing the lug 11,apertured or recessed for the passage therethrough of the upperextremity of the pistonrod, the latter having therebelow the shoulder 9,between which and the under side of the lug is interposed a spiralspring 8, which serves as a cushion between the piston and the movablemember of the governor.

The cylinder is provided with a petcock 26 at its lower portion, belowthe piston, for withdrawing any accumulations of water in the chamberand for facilitating the lowering of the piston under certaincircumstances.

Vith the conditions established for the desired running of the engine,the valve in the steam-pipe 14 being closed and the armature removedfrom the cores of the electromagnet holding the weighted lever 17in thehorizontal position, thus maintaining the valve at 15 closed, the pistonbeing understood as lowered, it will be seen that the governor may haveits ordinary reciprocatory movements as induced by the running speedwithout interfering with or with interference by the herein-describedappliances; but in case of exigency, upon the pressure of the contact 25against the one 24: closing the circuit the armature will be withdrawnfrom its position of detention relatively to the leveroperating rod,leaving the latter free to be swung hyits weight downwardly to the pendulous position shown in Fig. 2, opening the valve at 15, permittingpressure in the chamber below the piston, and forcing the latterupwardly sufficiently far as to impart all necessary vertical slidingmovement to the movable sleeve member B of the governor, thereuponthrough such movement to establish conditions for the immediatediscontinuance of the driving or running of the engine.

In order to thereafter bring about conditions whereby the running of theengine, which may have been suspended, as explained, may be resumed, thevalve-operating arm is swung to its position of engagement with thearmature, and the pressure under the piston being relieved the latterwill descend, and in order to relieve the pistonchamber, so that thepiston may unobstructedly be lowered, the petcock 26 may momentarily beopened.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. The combination with any engine-controlling mechanism as an ordinarygovernor, of an inclosed chamber having a diaphragm or piston thereinwhich is operatively connected with the engine-controller, a conduit forleading the pressure fluid into said chamber, having a valve, aself-operating valve-opening device, an electric circuit normally openwith means for closing it and comprising a source of electrical energy,an electromagnet and an armature, the latter being arranged to operateas a detent for the valve-opening device, for the purpose set forth.

2. The combination with a steam-engine governor having a movablereciprocatory member or sleeve-like part, of an inclosed chamber havingthe piston or diaphragm therein, and provided with a rod or stem adaptedon a suitably-extended movement of the piston to engage and operate themovable member of the governor, independent of its ordinary automaticgoverning operation, a conduit for a pressure fluid leading to thecylinder having a valve and a valve-operating device, an electromagnetcomprised in a suitable circuit normally open with means forpurposelyclosing it, and having an armature arranged to coact as a detent for thevalve-operating device, substantially as and for the purpose set forth.

3. In a stop mechanism for an engine, the combination with the movablemember,of the governor having the transverse projection, asteam-cylinder mounted adjacent the governor, having therein a pistonprovided with an upwardly-projecting rod having a forcing engagement inan upward direction with said transverse projection, a steam-pipeleading into said cylinder below the piston, having a valve providedwith a swinging valve-operating arm, the electromagnet and armaturewhich engage the said swinging arm, and electric circuit connections forthe electromagnet, substantially as described.

4. The combination with a movable member of an engine controller orgovernor, of a chamber having therein a movable diaphragm, arranged toengage said member of the governor, a conduit for conveying a pressurefluid into said chamber to act on the diaphragm, a valve for saidconduit, and means for opening and closing it.

5. In an electric stop mechanism for an engine, the combination with themovable engine-controlling member as the part B of the governor, havingthe transverse projection 11 of the chambered cylinder having thereinthe piston provided with the upwardly-extended rod which has theshoulder 9, the spring be tween said shoulder and the projection, andmeans for introducing at pleasure a pressure fluid into thecylinder-chamber, below the piston.

6. In a stop mechanism for a steam-engine, the combination with agovernor having the usual engine-controlling movable sleeve B, havingthe operating-rod d therewith connected, and provided with thetransverse projection 11, of the vertical cylinder 10, located adjacentthe governor having therein the piston with the upwardly-extending rodprovided with an abutment for an elevating engagement With the saidtransverse projection,

- LOUIS ST. PETER.

Witnesses:

W. G. MEADE, WM. S. BnLnoWs,

